The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey
We present results from an observing campaign to identify low-metallicity stars in the Best & Brightest Survey. From medium-resolution (R ∼ 1200-2000) spectroscopy of 857 candidates, we estimate the stellar atmospheric parameters (Teff, log, g, and [Fe/H]), as well as carbon and α-element abunda...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Astronomical Society
2020
|
| Online Access: | https://hdl.handle.net/1721.1/128688 |
| _version_ | 1826189277337223168 |
|---|---|
| author | Ezzeddine, Rana Frebel, Anna L. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Ezzeddine, Rana Frebel, Anna L. |
| author_sort | Ezzeddine, Rana |
| collection | MIT |
| description | We present results from an observing campaign to identify low-metallicity stars in the Best & Brightest Survey. From medium-resolution (R ∼ 1200-2000) spectroscopy of 857 candidates, we estimate the stellar atmospheric parameters (Teff, log, g, and [Fe/H]), as well as carbon and α-element abundances. We find that 69% of the observed stars have ≤ -1.0, 39% have ≤ -2.0, and 2% have ≤ -3.0. There are also 133 carbon-enhanced metal-poor (CEMP) stars in this sample, with 97 CEMP Group I and 36 CEMP Group II stars identified in the A(C) versus [Fe/H] diagram. A subset of the confirmed low-metallicity stars were followed-up with high-resolution spectroscopy, as part of the R-process Alliance, with the goal of identifying new highly and moderately r-process-enhanced stars. Comparison between the stellar atmospheric parameters estimated in this work and from high-resolution spectroscopy exhibit good agreement, confirming our expectation that medium-resolution observing campaigns are an effective way of selecting interesting stars for further, more targeted, efforts. |
| first_indexed | 2024-09-23T08:12:15Z |
| format | Article |
| id | mit-1721.1/128688 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:12:15Z |
| publishDate | 2020 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1286882022-09-23T11:37:30Z The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey Ezzeddine, Rana Frebel, Anna L. Massachusetts Institute of Technology. Department of Physics We present results from an observing campaign to identify low-metallicity stars in the Best & Brightest Survey. From medium-resolution (R ∼ 1200-2000) spectroscopy of 857 candidates, we estimate the stellar atmospheric parameters (Teff, log, g, and [Fe/H]), as well as carbon and α-element abundances. We find that 69% of the observed stars have ≤ -1.0, 39% have ≤ -2.0, and 2% have ≤ -3.0. There are also 133 carbon-enhanced metal-poor (CEMP) stars in this sample, with 97 CEMP Group I and 36 CEMP Group II stars identified in the A(C) versus [Fe/H] diagram. A subset of the confirmed low-metallicity stars were followed-up with high-resolution spectroscopy, as part of the R-process Alliance, with the goal of identifying new highly and moderately r-process-enhanced stars. Comparison between the stellar atmospheric parameters estimated in this work and from high-resolution spectroscopy exhibit good agreement, confirming our expectation that medium-resolution observing campaigns are an effective way of selecting interesting stars for further, more targeted, efforts. 2020-11-30T18:43:13Z 2020-11-30T18:43:13Z 2019-01 2020-10-23T14:04:23Z Article http://purl.org/eprint/type/JournalArticle 0004-637X https://hdl.handle.net/1721.1/128688 Placco, Vinicius M. et al. “The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey.” Astrophysical Journal, 870, 2 (January 2019): 122 © 2019 The Author(s) en 10.3847/1538-4357/AAF3B9 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Astronomical Society The American Astronomical Society |
| spellingShingle | Ezzeddine, Rana Frebel, Anna L. The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey |
| title | The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey |
| title_full | The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey |
| title_fullStr | The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey |
| title_full_unstemmed | The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey |
| title_short | The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey |
| title_sort | r process alliance spectroscopic follow up of low metallicity star candidates from the best brightest survey |
| url | https://hdl.handle.net/1721.1/128688 |
| work_keys_str_mv | AT ezzeddinerana therprocessalliancespectroscopicfollowupoflowmetallicitystarcandidatesfromthebestbrightestsurvey AT frebelannal therprocessalliancespectroscopicfollowupoflowmetallicitystarcandidatesfromthebestbrightestsurvey AT ezzeddinerana rprocessalliancespectroscopicfollowupoflowmetallicitystarcandidatesfromthebestbrightestsurvey AT frebelannal rprocessalliancespectroscopicfollowupoflowmetallicitystarcandidatesfromthebestbrightestsurvey |